init: seed content from candidature + mvp docs

content/docs-mvp/HARDWARE.md

@@ -0,0 +1,41 @@
+# Hardware Prototype Specs
+
+## Components List
+
+### Main Unit (Faux Rocher)
+- Raspberry Pi 4 (4GB)
+- Waveshare 4G HAT
+- Solar charge controller (MPPT)
+- LiFePO4 Battery (12V)
+
+### Underwater Unit
+- Hydrophone
+  - Reco: 192 kHz sampling, useful band 5 Hz–118 kHz
+- Pressure + temperature sensor (MS5837-30BA)
+- Conductivity sensor/probe (TBD)
+
+### Cables & Connectors
+- IP68 underwater connectors
+- Shielded audio cable (~5m)
+
+## Power / Energy Budget (estimation)
+
+**Inputs (production)**
+- Solar panel: **100 W**
+- Assumption: ~4 h/day equivalent full sun, ~70% end-to-end efficiency (MPPT + wiring + battery charge)
+- Energy/day (order of magnitude): **~280 Wh/day**
+
+**Outputs (consumption)** (order-of-magnitude, to be measured)
+- Raspberry Pi: ~5 W
+- 4G modem: ~2–6 W (depending on uplink)
+- ADC + sensors: ~0.5–1.5 W
+- Total average: **~8–12 W** → **~190–290 Wh/day**
+
+**Battery sizing example (12V LiFePO4)**
+- 24h autonomy: ~16–24 Ah
+- 3 days autonomy: **~50–75 Ah**
+
+**Transmission strategy**
+- If 4G throughput is OK: stream raw audio continuously.
+- If throughput is low: apply light denoise/filtering + compression to avoid transferring mostly noise.
+- If very low: send clips/events/features.